7.5" T-LOC from loc precision!

[bobbyg23]

It is a lot. I will test again for sure.

 

[SDramstad]

If your only using a single charge make sure it’s big enough to work. If 5 grams doesn’t blow it to bits then I would use it.

 

[bobbyg23]

If your only using a single charge make sure it’s big enough to work. If 5 grams doesn’t blow it to bits then I would use it.

Finally somebody thinks like me.. I like to make sure it blows off the nosecone. This was not enough to do any damage at all. I will test at 4 and 4.5 though just to see.

 

[DMehalko]

Isnt it 1g per inch of airframe diameter?

 

[jmuck78]

Had time to work on the avbay tonight. Very happy with the results.
View attachment 474971View attachment 474972View attachment 474973View attachment 474974View attachment 474975View attachment 474976

How did you get the motor/fin assembly into the fuselage once the electronics bay cover flange was bonded in place? Alternatively, how did you bond the electronics bay cover flange in once the motor/fin assembly was inserted into the fuselage? I just completed this step and it was a challenge to get the mid centering ring past the t-nuts on the cover flange.

 

[bobbyg23]

How did you get the motor/fin assembly into the fuselage once the electronics bay cover flange was bonded in place? Alternatively, how did you bond the electronics bay cover flange in once the motor/fin assembly was inserted into the fuselage? I just completed this step and it was a challenge to get the mid centering ring past the t-nuts on the cover flange.

The cover flange was just sitting loose between the 2 centering rings while I slid the fin can assy into the body. Once that epoxy had set up, I glued the flange to the body.

 

[bschultz32]

That old BP rule of thumb - 1 gram of FFFFG per 200 cubic inches of volume - has never failed me in over 25 years in the hobby.
Bob Schultz

 

[bobbyg23]

That old BP rule of thumb - 1 gram of FFFFG per 200 cubic inches of volume - has never failed me in over 25 years in the hobby.
Bob Schultz

So 5g should be right on.

 

[crossfire]

So 5g should be right on.

But a lot of volume is taken up by shock cord and chute.

 

[bobbyg23]

But a lot of volume is taken up by shock cord and chute.

True. I bet 4g will be perfect when I try it.

 

[DMehalko]

Pick a motor for it yet?

 

[bobbyg23]

Pick a motor for it yet?

Not yet.

 

[bobbyg23]

Chute should be here today. Can't wait to see it.

 

[crossfire]

Little less bp needed

I wonder how far cone would have went if not for shock cord?

 

[SDramstad]

I recently picked up an Altus Metrum Easy Mini. It has this nice feature for rockets like this. You can set it up so the apogee charge goes off like usual and the main charge will go off 2 seconds later. Gives you redundant charges at apogee with 1 altimeter. You could set the first charge size smaller and the second charge at the "blow it out or blow it up" size.

 

[bobbyg23]

I wonder how far cone would have went if not for shock cord?

Not too much further. It was almost put of energy when it reached the end of the shock cord.

 

[jmuck78]

The cover flange was just sitting loose between the 2 centering rings while I slid the fin can assy into the body. Once that epoxy had set up, I glued the flange to the body.

Yeah, that seems to have been the better way to go. I was concerned about maintaining the alignment of the flange and the cover since there is very little clearance between the cover and the rest of the air frame.

 

[bobbyg23]

Yeah, that seems to have been the better way to go. I was concerned about maintaining the alignment of the flange and the cover since there is very little clearance between the cover and the rest of the air frame.

When I dry fit everything, I traced the inside flange so I could get it in the correct spot. That way when it came time to glue it in, I knew right where to put it. I did have to sand a tiny bit on the hatch to get the fit perfect.

 

[bobbyg23]

Parachute showed up today.

 

[bobbyg23]

First launch was great going up. Sudden stop at the end

 

[bobbyg23]

Rebuilt and is 10" longer now.

 

[mikekebert]

I love how you painted and finished it, and I'm glad you were able to rebuild it. It would have been a real shame if it were one and done...

 

[Tim51]

Sorry to see the first flight was less than perfect. Like @mikekebert said, I'm also glad you've been able to rebuild. Any thoughts/theories on exactly what caused the zipper?

 

[Zbench]

That looks like a core sampling approach to me, not a zipper.

 

[Tim51]

That looks like a core sampling approach to me, not a zipper.

Ah - ok - looking again I see what you mean - or a lawn dart. I didn't notice the dirt on the nc.

 

[neil_w]

Rebuilt and is 10" longer now.
View attachment 481693View attachment 481694View attachment 481695View attachment 481696

Sorry about the mishap, that was a beautiful rocket. And now it is again it its new configuration. Strong "Solar Warrior" vibes.

 

[Philip Tiberius D.]

First launch was great going up. Sudden stop at the end
View attachment 481690View attachment 481691View attachment 481692

So what exactly happened, did the parachute not deploy or from the tear looks like it deployed too early ?

 

[SDramstad]

What size BP charge did you use? Did it go off?

 

[bobbyg23]

So what exactly happened, did the parachute not deploy or from the tear looks like it deployed too early ?

Somebody "cough, cough" forgot to arm the altimeter.

 

[bobbyg23]

That looks like a core sampling approach to me, not a zipper.

Yup. 8" sample.